/*
 *  Copyright 2005 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.mybatis.generator.config;

import static org.mybatis.generator.internal.util.StringUtility.stringHasValue;
import static org.mybatis.generator.internal.util.messages.Messages.getString;

import java.util.ArrayList;
import java.util.List;

import org.mybatis.generator.api.dom.xml.Attribute;
import org.mybatis.generator.api.dom.xml.Document;
import org.mybatis.generator.api.dom.xml.XmlElement;
import org.mybatis.generator.codegen.XmlConstants;
import org.mybatis.generator.exception.InvalidConfigurationException;

/**
 * 
 * @author Jeff Butler
 */
public class Configuration
{
    private List<Context> contexts;
    
    private List<String> classPathEntries;
    
    public Configuration()
    {
        super();
        contexts = new ArrayList<Context>();
        classPathEntries = new ArrayList<String>();
    }
    
    public void addClasspathEntry(String entry)
    {
        classPathEntries.add(entry);
    }
    
    /**
     * @return Returns the classPathEntries.
     */
    public List<String> getClassPathEntries()
    {
        return classPathEntries;
    }
    
    /**
     * This method does a simple validate, it makes sure that all required fields have been filled in and that all implementation classes exist and are of the proper type. It does not do any more
     * complex operations such as: validating that database tables exist or validating that named columns exist
     */
    public void validate()
        throws InvalidConfigurationException
    {
        List<String> errors = new ArrayList<String>();
        for (String classPathEntry : classPathEntries)
        {
            if (!stringHasValue(classPathEntry))
            {
                errors.add(getString("ValidationError.19")); //$NON-NLS-1$
                // only need to state this error once
                break;
            }
        }
        if (contexts.size() == 0)
        {
            errors.add(getString("ValidationError.11")); //$NON-NLS-1$
        }
        else
        {
            for (Context context : contexts)
            {
                context.validate(errors);
            }
        }
        if (errors.size() > 0)
        {
            throw new InvalidConfigurationException(errors);
        }
    }
    
    public List<Context> getContexts()
    {
        return contexts;
    }
    
    public void addContext(Context context)
    {
        contexts.add(context);
    }
    
    public Context getContext(String id)
    {
        for (Context context : contexts)
        {
            if (id.equals(context.getId()))
            {
                return context;
            }
        }
        return null;
    }
    
    /**
     * Builds an XML representation of this configuration. This can be used to persist a programtically generated configuration.
     * 
     * @return the XML representation of this configuration
     */
    public Document toDocument()
    {
        // note that this method will not reconstruct a properties
        // element - that element is only used in XML parsing
        Document document = new Document(XmlConstants.MYBATIS_GENERATOR_CONFIG_PUBLIC_ID, XmlConstants.MYBATIS_GENERATOR_CONFIG_SYSTEM_ID);
        XmlElement rootElement = new XmlElement("generatorConfiguration"); //$NON-NLS-1$
        document.setRootElement(rootElement);
        for (String classPathEntry : classPathEntries)
        {
            XmlElement cpeElement = new XmlElement("classPathEntry"); //$NON-NLS-1$
            cpeElement.addAttribute(new Attribute("location", classPathEntry)); //$NON-NLS-1$
            rootElement.addElement(cpeElement);
        }
        for (Context context : contexts)
        {
            rootElement.addElement(context.toXmlElement());
        }
        return document;
    }
}
